I re-listened to The Vanished podcast recently, and I'll add that there are a few things said about Sandra and her habits that, when taking into account other info about family relationships and dynamics that has been circulated, could suggest (IMO) that there is more to who Sandra was and the lifestyle she led.
A prominent example is when her SIL says Sandra was always in "tip-top shape" when getting ready to babysit her grandkids. I won't speculate on exactly what this could mean, but I do know that if I were talking about my MIL or aunt babysitting my kids, saying she was in "tip-top shape" would not be the first thing that comes to mind. I don't know, the choice of language is just interesting and a bit odd to me. If she was in "tip-top shape" when around her grandkids, I can't help but wonder what she was like and what "shape" she was in when the grandkids were not there, and what she did, and whether this could feed into the lack of concern on her neighbors' part.
Another example is when her cousin says she was "very sweet, not to make her sound like a saint..." I don't know why the last part was necessary there; saying someone was sweet doesn't canonize them, and it just feels like there's concern about painting a specific, almost rigid picture there, for better or for worse.
I've listened to other episodes of The Vanished, and they usually spend LOTS of time fleshing out who the missing person is as a person. I can't help but feel like Sandra's episode didn't go nearly as in-depth, and I couldn't help but notice that the same things were said about her every time as if for whatever reason it was important to the people involved to portray a very specific narrative... "Simple, private, homebody, kept to herself". This is used to describe her every single time. No quirks, no deviation beyond this description, which paints a picture of a woman who lived, by 21st century standards, a very reclusive life. Did she live like this 100% by choice?
There are other things about the podcast and what's said in it that just get to me, especially the parts where her "depression" is touched on, but I won't get into them here.
I just think there is far more to Sandra and her history than the public has been led to believe and that this could easily have a hand in why neighbors just aren't worried.
My opinion.